Track tab sort keys

crates/ely_browser_core/tests/tabs.rs

@@ -22,6 +22,39 @@ fn opens_new_tab_below_active_tab() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
+#[test]
+fn opened_tabs_receive_visible_sort_keys() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let first_tab_id = core.active_tab()?.id().clone();
+    let second_tab_id = core.open_tab(UrlText::parse("https://example.com")?);
+
+    core.select_tab(&first_tab_id)?;
+    let third_tab_id = core.open_tab(UrlText::parse("https://servo.org")?);
+    let snapshot = core.snapshot()?;
+    let ordered =
+        snapshot.tabs.iter().map(|tab| (tab.id().clone(), tab.sort_key())).collect::<Vec<_>>();
+
+    assert_eq!(ordered, vec![(first_tab_id, 0), (third_tab_id, 1), (second_tab_id, 2)]);
+    Ok(())
+}
+
+#[test]
+fn snapshot_orders_tabs_by_sort_key() -> Result<(), Box<dyn Error>> {
+    let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;
+    let first_tab_id = core.active_tab()?.id().clone();
+    let second_tab_id = core.open_tab(UrlText::parse("https://example.com")?);
+    let third_tab_id = core.open_tab(UrlText::parse("https://servo.org")?);
+
+    core.set_tab_sort_key(&second_tab_id, 30)?;
+    core.set_tab_sort_key(&third_tab_id, 10)?;
+    core.set_tab_sort_key(&first_tab_id, 20)?;
+    let snapshot = core.snapshot()?;
+    let ordered_ids = snapshot.tabs.iter().map(|tab| tab.id().clone()).collect::<Vec<_>>();
+
+    assert_eq!(ordered_ids, vec![third_tab_id, first_tab_id, second_tab_id]);
+    Ok(())
+}
+
 #[test]
 fn opened_tabs_record_active_tab_as_parent() -> Result<(), Box<dyn Error>> {
     let mut core = BrowserCore::new(InitialBrowserConfig::ely_defaults()?)?;